Crossword Genius

Greek mathematician, astronomer and geographer of second century AD (7)

Ross

I believe the answer is:

ptolemy

(Other definitions for ptolemy that I've seen before include "Egyptian ruler; Greek astronomer" , "Greek astronomer; Greco-Egyptian ruler" , "Ancient astronomer" , "Alexandrian astronomer" , "Egyptian king or astronomer" .)

I've seen this clue in The Telegraph.
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